Quote from: Epoch on Today at 09:33:20 PM

Yeah, I couldn't figure that drop from 45T to 30T out; the tuning process seemed to have completed successfully because there is a flag in the web interface that indicates when tuning completes. I let a few units cool down to ambient for 24h before powering them up again, thinking they might be running too hot; but my observation was once they took that initial drop from 45T to 30T they would never tune up to beyond 30T from a 'cold' start again; the 'factory reset' button didn't change that behaviour.

They were in an air conditioned datacenter since first arriving; ambient there is kept at 25-26C. Nothing different from when first powered up at 45T, to some weeks/months later when they would only power up to 30T. And now they won't power up at all. I can see a green light on the controller board itself, but none of the externally visible LEDs turn on, nor do the fans spin up.

I may have a bad batch; it happens. I've seen the usual posts here of some people having various Pangolin/MicroBT hardware issues, along with Bitmain hardware issues, etc. The usual expected issues. Nothing particularly out of the ordinary. Current mining hardware quality is generally known to be 'not great'. But I'm mostly disappointed by the lack of vendor support in this case. Butterfly Labs, Spondoolies, even Bitmain support was leagues beyond the silence from Pangolin. Not something I would have expected.

Have you tried opening them and cleaning a bit and visual inspecting if anything is damaged?